unrounded
Adjective
Meaning
unrounded (comparative more unrounded, superlative most unrounded)
Not rounded.
Synonyms
Examples
Rounded vowels that are front in tongue position are front-central in formant space, while unrounded vowels that are back in articulation are back-central in formant space.
In places where vowels are paired, the right represents a rounded vowel (in which the lips are rounded) while the left is its unrounded counterpart.
In the case of u-umlaut, this entails labialization of unrounded vowels.
Later modifications to his theory allowed for an additional set of eight "secondary Cardinal Vowels" with reverse lip shapes, permitting the representation of eight secondary cardinal vowels (front rounded and back unrounded).
Nonetheless, even in those languages there is usually some phonetic correlation between rounding and backness: front rounded vowels tend to be more front-central than front, and back unrounded vowels tend to be more back-central than back.
Note that some of those diphthongs have been unrounded in several dialects.